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Abstract

This Article reviews and assesses corporate tax reforms advocated by President Donald Trump during his presidential campaign and signed into law since taking office (the Tax Cuts and Jobs Act of 2017), in light of economic theory and the Modigliani-Miller Irrelevance Theorem. The Ar-ticle argues that companies will adapt polcies in light of new taxation mea-sures, thereby impacting the effectiveness of reform. In support of this conclusion, the Article surveys two empirical studies—one in relation to the repatriation efforts of President Bush’s Homeland Investment Act and an-other in relation to unexpected changes to the taxation of Canadian income trusts—to highlight how reform measures can lead to unanticipated results. The Article then applies the principles of these studies, the general eco-nomic theories, and the Modigliani-Miller Irrelevance Theorem to cast un-certainty on the net effect of Trump’s tax reforms. Next, the Article reviews the constitutionality of a “border adjustment tax.” This tax was proposed during the election campaign, but was ultimately jettisoned in the final tax reform bill. Specifically, it analyzes whether such a policy is constitutional or whether it is an unconstitutional direct tax, not apportioned between the States that does not qualify as income under the Sixteenth Amendment. The Article shows that such a constitutional challenge is a difficult under-taking given the substantive arguments in favor of constitutionality, the rar-ity of judicial intervention in overturning tax laws, and the wide discretion of Congress to levy taxes on income. Finally, the Article concludes by con-sidering the role of economic analysis on constitutional challenges to tax legislation and provides an overview of the arguments, both for and against, utilizing economic analysis in this regard. The conclusion includes a review of the various cases and defining principles (emphasizing the deci-sions of Judge Richard Posner) where economic analysis has been used in the statutory interpretation of tax laws.